Hapon, Hanna O., Olena V. Pavlovich, Taisiia O. Yurchuk, Mykola V. Repin, and Larysa M. Marchenko. 2019. “Ultrastructural Characteristics of Human Sperm After Cryopreservation With Polyvinylpiralidon by Vitrification”. Problems of Cryobiology and Cryomedicine 29 (2):178. https://doi.org/10.15407/cryo29.02.178.